Difference or Gap of days between two given dates using C#
By Deviprasad D MahaleIn this tutorial, you will be learning how to find the difference or gap between two dates in C#.
The user will enter two dates in the form of DD\MM\YYYY. The total number(gap or difference) of days between two date is an output.
Design:
There are many approaches to solve this problem:
- The first approach is to find the number of days from the date d1 to date d2.
- The second approach is to find the number of days(nd1) before the date d1 i.e., from 00/00/0000 and number of days(nd2) before the date d2. The difference between the two days(nd2-nd1) obtained is the actual gap between the two dates.
We will implement the second approach as it is straight forward and easy to understand.
Example:
Let the two dates be:
d1 = 2/2/2018
d2=1/2/2019
Count number of days before d1. Let this count be nd1. The leap year contains an extra day that has to be added to nd1.
nd1 = year*365+month[i]+dd+number of leap year.
where 1<=i<mon and month[] is array of no of days in each month
Therefore nd1=2018*365+(31)+2+number of leap years.
To calculate the number of leap years:
Count of leap year for a date ‘dd/mm/yyyy’ can be calculated using the following formula:
- Number of leap years = y/4 – y/100 + y/400 if m > 2
- Number of leap years= (y-1)/4 – (y-1)/100 + (y-1)/400 if m <= 2
(All above divisions must be done using integer arithmetic so that the remainder is ignored)
for date 2/2/2018, the number of leap year is:
Number of leap years=2017/4-2017/100+2017/400=489 (using 2nd formula as m<=2)
Therefore, nd1=2018*365+(31)+2+489=737092
Similarly, find the number of days before date2, i.e nd2=737456
Therefore, the number of days between date1 and date2 is (nd2-nd1) 364 days.
Difference between two dates in C#
Below shows the program to find the number of days between two dates in C# using the above approach.
// C# program two find number of days between two given dates
using System;
class pgm
{
public class Date
{
public int day, mon, year;
};
static void get_date(Date d)
{
Console.WriteLine("Enter day:");
d.day=int.Parse(Console.ReadLine());
Console.WriteLine("Enter month:");
d.mon=int.Parse(Console.ReadLine());
Console.WriteLine("Enter year:");
d.year=int.Parse(Console.ReadLine());
}
static int []monthDays = {31, 28, 31, 30, 31, 30,
31, 31, 30, 31, 30, 31};
// This function counts number of
// leap years before the given date
static int countLeapYears(Date d)
{
int years = d.year;
// Check if the current year
// needs to be considered
// for the count of leap years or not
if (d.mon <= 2)
{
years--;
}
return years / 4 - years / 100 + years / 400;
}
// This function returns number
// of days between two given dates
static int getDifference(Date dt1, Date dt2)
{
// COUNT TOTAL NUMBER OF DAYS
// BEFORE FIRST DATE 'dt1'
// initialize count using years and day
int nday1 = dt1.year * 365 + dt1.day;
// Add days for months in given date
for (int i = 0; i < dt1.mon- 1; i++)
{
nday1 += monthDays[i];
}
// Since every leap year is of 366 days,
// Add a day for every leap year
nday1 += countLeapYears(dt1);
// SIMILARLY, COUNT TOTAL
// NUMBER OF DAYS BEFORE 'dt2'
int nday2 = dt2.year * 365 + dt2.day;
for (int i = 0; i < dt2.mon - 1; i++)
{
nday2 += monthDays[i];
}
nday2 += countLeapYears(dt2);
// return difference between two counts
return (nday2 - nday1);
}
public static void Main(String[] args)
{
Date dt1 = new Date();
Date dt2 = new Date();
Console.WriteLine("Enter the date in the pattern i.e dd/mm/yy");
Console.WriteLine(" First Date :");
get_date(dt1);
Console.WriteLine(" Second Date :");
get_date(dt2);
Console.WriteLine("******First Date******");
Console.WriteLine(dt1.day+"\\"+dt1.mon+"\\"+dt1.year) ;
Console.WriteLine("******Second Date*****");
Console.WriteLine(dt2.day+"\\"+dt2.mon+"\\"+dt2.year) ;
Console.WriteLine("******Result*****");
Console.WriteLine("Difference between two dates is " + Math.Abs( getDifference(dt1, dt2))+" days");
}
}
// This code is contributed by DEVIPRASAD D MAHALE
Output:
Enter the date in the pattern i.e dd/mm/yyyy First Date Enter the date:2 Enter the month:2 Enter the date:2018 Second Date: Enter the date:1 Enter the month:2 Enter the date:2019 ********** First Date ********** Date is 2/2/2018 ********** Second Date ********** Date is 1/2/2019 ********** Result ********** Difference between two dates is 364 days.
Hope you have understood the above program to find the difference or gap between two given dates in C#.
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